remove default paddle button mappings

Turns out these are inaccessible in Steam's game mode and instead Steam forces you to map them to something else. Therefore users can just map them to their respective keyboard keys.

Author: itsmattkc

rpi/ui/ui_sdl.c

@@ -85,10 +85,6 @@ void init_gamepad()
     button_map[SDL_CONTROLLER_BUTTON_DPAD_DOWN] = VANILLA_BTN_DOWN;
     button_map[SDL_CONTROLLER_BUTTON_DPAD_LEFT] = VANILLA_BTN_LEFT;
     button_map[SDL_CONTROLLER_BUTTON_DPAD_RIGHT] = VANILLA_BTN_RIGHT;
-    button_map[SDL_CONTROLLER_BUTTON_PADDLE1] = VANILLA_BTN_HOME;
-    button_map[SDL_CONTROLLER_BUTTON_PADDLE2] = VPI_ACTION_DISCONNECT;
-    button_map[SDL_CONTROLLER_BUTTON_PADDLE3] = VPI_ACTION_SCREENSHOT;
-    button_map[SDL_CONTROLLER_BUTTON_PADDLE4] = VPI_ACTION_TOGGLE_RECORDING;
     axis_map[SDL_CONTROLLER_AXIS_LEFTX] = VANILLA_AXIS_L_X;
     axis_map[SDL_CONTROLLER_AXIS_LEFTY] = VANILLA_AXIS_L_Y;
     axis_map[SDL_CONTROLLER_AXIS_RIGHTX] = VANILLA_AXIS_R_X;